`sig
type t
val get : (Thread.t -> Linux_ext.Clock.t) Core_kernel.Std.Or_error.t
val get_time : (Linux_ext.Clock.t -> Span.t) Core_kernel.Std.Or_error.t
val set_time :
(Linux_ext.Clock.t -> Span.t -> unit) Core_kernel.Std.Or_error.t
val get_resolution :
(Linux_ext.Clock.t -> Span.t) Core_kernel.Std.Or_error.t
val get_process_clock :
(unit -> Linux_ext.Clock.t) Core_kernel.Std.Or_error.t
val get_thread_clock :
(unit -> Linux_ext.Clock.t) Core_kernel.Std.Or_error.t
end`